The rear suspension assembly is robust and well engineered, as might be expected with a Kawasaki product. However, the hostile environment the machinery of the type this component fits operates, means mechanical wear or damage is bound to occur sooner or later.
The swing-arm pivot bearings (sleeves 420361064 & bearings 921501842) at the very least, probably require replacement. Check the other potential areas for wear and damage on the hard-working suspension assembly?
Other related parts you may wish to consider depending on the scale of the refurb, both mechanical and cosmetic:
This component may have other applications within the Kawasaki model range. Please ensure the part numbers are correct for your machine prior to placing your order.
Add as many new components to the same shopping cart as you wish, new bolts (nice fresh sharp threads) 130G0640 screws 920091286 & nuts 920151407920151426 for example, and still only pay the same single fixed price shipping cost.